Ubuntu CLI install error

While trying to put together a “generic” how-to on installing Duplicati in Ubuntu (Linux-Lite) I got the following error after running sudo apt install duplicati_2.0.2.1-1_all.deb:
Reading package lists… Done

Building dependency tree
Reading state information… Done
E: Unable to locate package duplicati_2.0.2.1-1_all.deb
E: Couldn’t find any package by glob 'duplicati_2.0.2.1-1_all.deb’
E: Couldn’t find any package by regex ‘duplicati_2.0.2.1-1_all.deb’

Any ideas what I did wrong or how to fix it?

Note that I was able to install just fine via the Linux-Lite “Install / Remove Software” option.

I have not set up a PPA, so you cannot use apt.
This should do it though:

sudo dpkg -i duplicati_2.0.2.1-1_all.deb
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That won’t automatically install mono, will it?

No, you still have to follow this: https://www.mono-project.com/download#download-lin